STEP 6
Now time to enlarge the size. Go to Edit>Free Transform or you can press Ctrl+T/Cmd+T.
In the option panel, change the Height to 115%. This should enlarge the size of the eye. If you want to decrease the size, then change the Height to 80-90%. Once you are done with the size press Enter/Return to finalize the Free Transform Tool.
Your image should look like this. To see the difference you can turn the visibility of Layer 1 on/off.